The arrival of the post-World-War-II 331/3-r.p.m, high-fidelity, long-playing recording was embraced by the legendary Aeolian-Skinner Organ Company of Boston as a means of promoting its product. In the course of approximately twenty years, thirty volumes of the series, entitled The King of Instruments, were released. The series can be divided into three groups, (1) The Harrison Era, (2) The Whiteford Era, and (3) The Post-Whiteford Era.